Core drill



Jan. '12" 1,926.- 1,565653 H. B. HALVORSEN 'coRE DRILL Filed May 5, 1924 Patented Jan. 12, 1926.

UNITED STATES-I PAT N F1E+I manna B. mnvonsnn, or anemoan ori'Y, momma, assmnoa 'ro slizcxg viinv MACHINERY, COMPANY, A CORPORATION OF MASSAOHUQETTB.

--coan DRILL.

. Application filed Kay 5,

To all 'ilzlwm it. concern: 7

Be it known that HALBnRT B. Harmon- SEN, a citizen of the Ilnited States, residing at Michigan Cit in thecounty of Laporte and State of In iana, have invented certain new and useful-Improvements in Core Drills,

of which the following is a full, clear, and exact specification. a

My invention relates to core drills.

An object of my invention is to provide an improved core lifter mec anism'for such a drill. Still another object of my invention is to provide an'improvd core lifter mechanism having great strength and elasticity.

These and other objects and advantages of my' invention will, however, hereinafter more fu'llyappear. -In the accompanying drawings I have shown for purposes of illustration -two forms which my invention may assume in practice, In. these drawings, I Fig. 1 is a central longitudinal sectional view of the lower end'of a core barrel and a drill bitin which m improved mechanism is embodied, the li er section being online 1'1 of Fig. 2.

Fig. 2 is a plan view of my improved core lifter mechanism. I

Fig. 3 is a side elevation of Fi 2.

Fig. 4 is a plan view of a modified form of construction. 3

In the illustrative formof my invention shown in Figs. 1 to 3, I have shown'a hollow core barrel 1 threadedly connected as at 2 to the upper end of a core lifter casing or shell 3, while the lower end thereof is thread edly connected as at 4 tea core drill bit 5,

- herein of the usual rotary diamond type.-

The-core lifter casing 3 is also as usual provided with an internal conical bore 6 inwhich a core lifter, generally. designated 7, and of improved form, is disposed.

In my improved-mechanism the core lifter comprises a plurality of radially spaced wedgl members 8'of identical construction whic are provided with inclined'surfaces 9 formed on their outer peripheries which enga e the surface of the bore 6 formed in the casing 3, ,The lower inner ends of these wedges are provided with inwardly inclined surfaces 10, which-direct the core upwardly through, the core lifter. A radially expanding sheet metal core gripping spring member tion may be modified and embodied in other 924. fierlai so. 710,903.

11 is also rigidl connected to the inner pe rip'her-ies 12 of t e wedges by'means of rivets 13, the latter being peened ,or headed over into counter-sunk bores 14 formed in the sprin and the wedges. .It will also be ob.- serve that the lower end of the radially expending member '11 is spot weldedas'at 15, forming a smooth joint, while the upp'erlfend of the annular spring member 11 is provided with inwardly projecting fingers 16- inside each wedge. The radially expanding member 11 and one of the wedges 8 are also split as at 17, thereby permitting the ready expansion andcontraction of 'thercore lift-' er. Inthe form of my invention shown in Fig. 3, the spring 11' is provided with inwardly curved radially spaced surfaces 18 which are-adapted to enga e the core, the' spring 11 being spot welded'to the wedges 8' as at 19, thereby permitting a rigid con-'- struction to be obtained.

While I have in this a cally described two forms w 10h my invention may assume in practice, it will be understood 7 I that these formsof the same are shown for o purposes of illustraton and that the inven-' formswithout departin from its spirit ;or the scope of the appende claims:

What I claim as new and desire to secure by Letters Patent is 1. A corelifter comprising separate spaced wedge shaped supporting 1 members, core gripping means provided with projecting core engaging members, and means for rigidly securlng each of said supporting members to said 'core gripping means. r I 2.. A core lifter comprising separatc'spaced wedge shaped supporting members, core gripping means having resilient projecting core engaging members, and means';for rigbers to said 'ppiug means 3. A core li l ter comprising separate spacedwedge shaped supporting, members, core gripping means having resilient pro ecting core engaging members, and means forrigidly securing each of said supporting memidly securing each of said wedge members to l the outer surface of said core grippingsnemv ber.

4. A core lifter, comprising se arate spaced 7 wedge shaped supporting mem rs, resilient core grippingmeans connecting said mem- 3 bers said gr pping means having inwardly plication specifi- 'projecting core engaging members, and

means for rigidl securing each of said wedg members tosai I resilient means. a I

4 5. A core lifter comprising separate spaced wedge shaped supporting members, spring core gripping means having auxiliary core engaging means formed thereon, and'means -for rigidly connecting each .of said "supporting members to said spring means.

6; A'core lifter compnsmg separate radisally spaced wedge shaped supporting members, a radially ex'pansible core gripping member having spring core engaging means carried thereby, and means forrlgldly securing each of said supporting members to said expansible member.

7. A core lifter comprising separate spaced wedge shaped core supporting members, core gripping means having inwardly extending sprlng'core ,engagmg means carried thereby,

and means for rigidly connecting each of said supporting members to said core gripping means. H p

8. A core lifter comprising separate spaced wedge shaped supporting members, a resilient annular split spring having core gripping elements formed thereon, and meansfor rigidly securing each of said supporting members to the innersurface of said spring.

9. ,A core liftercomprisingseparate spaced wedge shaped supporting members each hav: ing an inwardly inclined core guiding surface and a reduced portion, a splitannular core gripping member disposed 1n said re- I duced portions adjacent said core guiding surfaces, and means for rigidly securlng each "supporting member to the outer surface of said core grippin member.

. 10. A' core li er comprising separate spaced wedge shaped supporting members ,each having a reduced inner surface and an inwardly projecting shoulder, a split annular core gripping member disposed adjac nt said surface, the shoulders on said wedge members underlyingiethe lower edge of said core grippingmem r, and means for rigidly securing each supporting member to the outer surface of said core gripping member.

11. A core lifter compr sing separate spaced wedge shaped supporting members each having an inclined outer surface and a straight inner surface, a split annular s ring mem er having core engaging means t, ere- -on, and means for securing said spring member'to the inner surface of each of said wedge members. e 12; A core lifter comprising separate spaced wedge shaped supporting members In testlmonywhereof I afiix my signature HALBERT B. HALVORSEN. 

